The period of an Earth satellite depends on the satellite's
A) mass.
B) weight on Earth.
C) radial distance from Earth.
D) all of the above
E) none of the above
Answer: C
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Why is Venus so much hotter than the Earth?
A) because it has much more carbon dioxide in its atmosphere B) because it rotates backwards compared to its orbital rotation C) because its clouds have a very high re?ectivity D) because it is closer to the Sun
Must acupuncture be responsible for the patients' recovery?
A) No. Acupuncture may be responsible for the healing, or it may not. Correlation does not necessarily imply causation. B) Yes. If the study was run by qualified M.D.s, then we should respect their findings that acupuncture cured these patients. C) No. Acupuncture is hippie, new age stuff, and is not respected by reputable doctors. D) Yes. The patients stated afterwards that they knew it had helped, and these people know their own bodies better than we do.
Two masses are suspended by cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, 
has a mass of 6.0 kg and the other mass,
has a mass of 4.0 kg. The force of the cord attached to 
is
A. 47 N upward.
B. 47 N downward.
C. 33 N upward.
D. 33 N downward.
E. 15 N upward.
Heat has the same units as:
A. temperature B. work C. energy/time D. heat capacity E. energy/volume